Choose a version:
26% The original file has 641961 bytes (626.9k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 168444 bytes (164.5k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56544 bytes (55.2k)
 local copy
gzip -9
  56475 bytes (55.2k)
 local copy
libdeflate -12
  53799 bytes (52.5k)
 local copy
7zip -mx=9 -tgzip
  53783 bytes (52.5k)
 local copy
kzip -s0 -rn -b1
  53713 bytes (52.5k)
 local copy
zultra
  53707 bytes (52.4k)
 local copy
pigz -11 -n
  53695 bytes (52.4k)
 local copy
Zopfli
  53618 bytes (52.4k)
 local copy
Zopfli (defluff)
  53614 bytes (52.4k)
 local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.16.5.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.16.5 file, ETag caching is available and
if your browser doesn't support GZIP decompression then the uncompressed version will be sent.

Currently best Zopfli settings

You can use my super-compressed files for whatever purpose you like as long as you respect the library's original license agreement.
There are no restrictions from my side - but please avoid hot-linking if you run a high-traffic website.

These command-line settings yielded the best compression ratio so far (Linux version of zopfli-krzymod):
zopfli --i1000000 --mb8 --mls128 --bsr8 --lazy --ohh

(found March 2, 2022)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 128  --mls128
block splitting recursion 8  --bsr8
lazy matching in LZ77 yes  --lazy
optimized Huffman headers yes  --ohh
initial random W for iterations 1  --rw1
initial random Z for iterations 2  --rz2

Even Smaller Files Thanks To Defluff

Zopfli's output can be further optimized by the defluff tool.
In this particular case, defluff saves 4 more bytes (53614 bytes).
Download

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.16.5/dojo.js --location | md5sum
d83a2f2269f077f93980fbffc5641803  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.16.5.min.zopfli.js.gz | md5sum
d83a2f2269f077f93980fbffc5641803  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.16.5/dojo.js --location | sha1sum
ac6f3a8914e5064bb2051bbece9991c65e6af819  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.16.5.min.zopfli.js.gz | sha1sum
ac6f3a8914e5064bb2051bbece9991c65e6af819  -

Other Versions

Available Dojo versions at minime.stephan-brumme.com:

1.17.3, 1.17.2, 1.17.1, 1.17.0,
1.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1, 1.16.0,
1.15.6, 1.15.5, 1.15.4, 1.15.3, 1.15.2, 1.15.1, 1.15.0,
1.14.9, 1.14.8, 1.14.7, 1.14.6, 1.14.5, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14.0,
1.13.10, 1.13.9, 1.13.8, 1.13.7, 1.13.6, 1.13.5, 1.13.4, 1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.11, 1.12.10, 1.12.9, 1.12.8, 1.12.7, 1.12.6, 1.12.5, 1.12.4, 1.12.3, 1.12.2, 1.12.1,
1.11.13, 1.11.12, 1.11.11, 1.11.10, 1.11.9, 1.11.8, 1.11.7, 1.11.6, 1.11.5, 1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
1.10.10, 1.10.9, 1.10.8, 1.10.7, 1.10.6, 1.10.5, 1.10.4, 1.10.3, 1.10.2, 1.10.1, 1.10.0,
1.9.11, 1.9.10, 1.9.9, 1.9.8, 1.9.7, 1.9.6, 1.9.5, 1.9.4, 1.9.3, 1.9.2, 1.9.1, 1.9.0,
1.8.14, 1.8.13, 1.8.12, 1.8.11, 1.8.10, 1.8.9, 1.8.8, 1.8.7, 1.8.6, 1.8.5, 1.8.4, 1.8.3, 1.8.2, 1.8.1, 1.8.0,
1.7.12, 1.7.11, 1.7.10, 1.7.9, 1.7.8, 1.7.7, 1.7.6, 1.7.5, 1.7.4, 1.7.3, 1.7.2, 1.7.1, 1.7.0,
1.6.5, 1.6.4, 1.6.3, 1.6.2, 1.6.1, 1.6.0,
1.5.6, 1.5.5, 1.5.4, 1.5.3, 1.5.2, 1.5.1, 1.5.0,
1.4.8, 1.4.7, 1.4.6, 1.4.5, 1.4.4, 1.4.3, 1.4.2, 1.4.1, 1.4.0,
1.3.3, 1.3.2, 1.3.1, 1.3.0,
1.2.3, 1.2.2

The project site contains an overview how well these versions were compressed.
Other interesting projects are AngularJS, BackboneJS, Bootstrap, D3, Ember, jQuery, Knockout, lodash, React, Socket.IO, ThreeJS, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:
Size Improvement Parameters Found
53618 bytes -2 bytes zopfli --i1000000 --mls128 --bsr8 --lazy --ohh March 2, 2022 @ 21:46
53620 bytes -4 bytes zopfli --i100000 --mls128 --bsr8 --lazy --ohh March 2, 2022 @ 11:45
53624 bytes -1 byte zopfli --i10000 --mls128 --bsr8 --lazy --ohh February 25, 2022 @ 11:07
53625 bytes -4 bytes zopfli --i10000 --mls128 --bsr13 --lazy --ohh February 25, 2022 @ 07:23
53629 bytes -2 bytes zopfli --i1000 --mls128 --bsr6 --lazy --ohh February 24, 2022 @ 19:14
53631 bytes -1 byte zopfli --i1000 --mls32 --bsr18 --lazy --ohh February 24, 2022 @ 19:02
53632 bytes – zopfli --i100 --mls128 --bsr6 --lazy --ohh February 24, 2022 @ 16:30

If there are multiple parameter sets yielding the same compressed size, only the first one found is shown.

Most recent activity on March 3, 2022 @ 09:59.

Heatmaps

This Zopfli heatmap visualizes how compression changes when modifying the --bsr and --mls parameter.
Cell's contents is the best filesize achieved (in bytes, hover with mouse over cells to see number of iterations).

Good parameters are green, bad are red. The best and worst are bold as well.
The brightness of the blue background color indicates how many iterations were processed:
10,000, 100,000 or 1,000,000.
bsr \ mls
2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768
bsr \ mls
2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768
2 53664 53643 53630 53628 53626 53629 53626 53626 53629 53628 53631 53630 53630 53652 53648
4 53661 53665 53648 53645 53638 53637 53629 53627 53635 53629 53633 53635 53638 53650 53635
6 53664 53659 53633 53629 53639 53634 53627 53637 53637 53636 53642 53647 53642 53645 53636
7 53641 53663 53665 53653 53632 53638 53633 53636 53636 53631 53638 53634 53638 53631 53639
8 53654 53655 53661 53642 53631 53642 53618 53627 53639 53644 53644 53647 53644 53643 53639
9 53664 53641 53634 53629 53629 53630 53626 53625 53636 53635 53640 53650 53640 53646 53639
10 53638 53642 53630 53665 53630 53641 53628 53629 53636 53635 53640 53633 53637 53635 53640
11 53642 53638 53632 53655 53628 53627 53625 53629 53636 53634 53637 53633 53637 53635 53637
12 53659 53657 53636 53634 53629 53626 53625 53630 53636 53637 53641 53651 53637 53639 53644
13 53641 53646 53625 53629 53629 53639 53625 53626 53637 53647 53638 53635 53638 53635 53637
14 53641 53642 53658 53663 53626 53626 53625 53628 53635 53636 53638 53634 53639 53639 53642
15 53641 53642 53644 53653 53629 53642 53626 53636 53635 53631 53643 53633 53637 53648 53641
16 53656 53657 53651 53652 53632 53642 53642 53636 53637 53629 53640 53636 53638 53647 53638
17 53650 53646 53654 53662 53631 53631 53625 53635 53635 53637 53647 53656 53637 53648 53640
18 53642 53633 53630 53658 53629 53631 53618 53629 53635 53645 53641 53644 53640 53640 53644
19 53653 53655 53644 53629 53630 53643 53625 53629 53636 53637 53644 53656 53637 53640 53642
20 53643 53644 53644 53627 53629 53626 53625 53636 53635 53637 53637 53652 53638 53644 53645
21 53649 53664 53656 53664 53630 53637 53638 53629 53636 53637 53645 53651 53637 53645 53642
22 53655 53642 53635 53659 53626 53638 53625 53635 53636 53634 53637 53636 53639 53644 53640
23 53640 53651 53645 53658 53628 53639 53618 53626 53635 53644 53643 53645 53637 53647 53642
25 53655 53652 53655 53660 53626 53638 53639 53626 53635 53637 53638 53639 53638 53642 53644
30 53649 53659 53655 53665 53631 53638 53639 53642 53634 53635 53641 53651 53638 53647 53639
40 53655 53658 53656 53662 53628 53635 53621 53635 53636 53638 53637 53653 53636 53645 53639

Due to the Monte Carlo design of my search algorithm, not all parameters have reached the same number of iterations yet:
Iterations Min. Bytes Reduction Coverage
100 53632 bytes – 100%
1,000 53629 bytes -3 bytes 100%
10,000 53624 bytes -5 bytes 100%
100,000 53620 bytes -4 bytes 1.16%
1,000,000 53618 bytes -2 bytes 0.87%
10,000,000 – – –

KZIP has far less options available for tuning/optimization. I only played around with the number of blocks (parameter -n):
Blocks Min. Bytes Compared To Best Zopfli Compared To Best KZIP
(any) 53790 bytes +172 bytes (+0.32%) +77 bytes
1 53713 bytes +95 bytes (+0.18%) –
2 53748 bytes +130 bytes (+0.24%) +35 bytes
3 53760 bytes +142 bytes (+0.26%) +47 bytes
4 53787 bytes +169 bytes (+0.32%) +74 bytes
5 53806 bytes +188 bytes (+0.35%) +93 bytes
6 53865 bytes +247 bytes (+0.46%) +152 bytes
7 53870 bytes +252 bytes (+0.47%) +157 bytes
8 53864 bytes +246 bytes (+0.46%) +151 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
However, support for Brotli is constantly growing - for example, your browser actually supports it !
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 39406 bytes -14212 bytes (-26.51%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 47052 bytes -6566 bytes (-12.25%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47992 bytes -5626 bytes (-10.49%)
Brotli (Wikipedia) brotli brotli -q 11 49504 bytes -4114 bytes (-7.67%)
LZMA2 (Wikipedia) xz xz -9 50580 bytes -3038 bytes (-5.67%)
Zstandard (Wikipedia) zstd zstd -19 51931 bytes -1687 bytes (-3.15%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 52241 bytes -1377 bytes (-2.57%)

Detailled Analysis

I wrote a DEFLATE decoder in Javascript. Click the button below to start a client-side analysis of the smallest gzipped files (may take a second):
Load and Parse Data


Notes: pigz is a fast open source multi-threaded implementation of gzip written by one of the original authors of gzip.
However, when using compression level 11, pigz actually switches to the slower Zopfli algorithm and isn't multi-threaded anymore.
KrzyMOD's extensions to Zopfli offer the highest level of configuration and is therefore used for my brute-force search.
Ken Silverman wrote the closed-source KZIP compression program and Jonathon Fowler ported it to Linux.
Defluff was created by Joachim Henke; DeflOpt is a tool by Ben Jos Walbeehm.

website made by Stephan Brumme in 2015 and still improving in 2026.
all timestamps are displayed in central european time. see my changelog.
no flash, not even images or external css files - and everything squeezed into a single html file.
which was handsomely compressed before releasing it into the wild internet - obviously.

please visit my homepage and my blog, too.
email: minime (at) stephan-brumme.com

All trademarks are property of their respective owners. You know, the boring legal stuff.